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MDS-S50
8. Turn the [ AMS ] knob so that the waveform of the
oscilloscope becomes the specified value.
(When the [ AMS ] knob is turned, the of “EFB= ”
changes and the waveform changes) In this adjustment, wave-
form varies at intervals of approx. 2%. Adjust the waveform
so that the specified value is satisfied as much as possible.
(Write power traverse adjustment)
Traverse Waveform
9. Press the [YES] button, and save the adjustment results in the
non-volatile memory. (“EFB = SAVE” will be displayed
for a moment)
10. “EFB = MO-P” will be displayed.
The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Turn the [ AMS ] knob until the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
Traverse Waveform
12. Press the [YES] button, and save the adjustment results in the
non-volatile memory. (“EFB = SAVE” will be displayed
for a moment)
Next “EF MO ADJUST” (C07) is displayed. The disc stops
rotating automatically.
13. Press the Z button and take out the disc.
14. Load the check disc (TDYS-1).
15. Turn the [ AMS ] knob to display “EF CD ADJUST”
(C08).
16. Press the [YES] button to display “EFB = CD”. Servo is
imposed automatically.
17. Turn the [ AMS ] knob so that the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
Traverse Waveform
18. Press the [YES] button, display “EFB = SAVE” for a mo-
ment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” (C08) will be displayed.
19. Press the Z button and take out the check disc (TDYS-1).
Adjustment Location: BD board (see page 32)
5-13. FOCUS BIAS ADJUSTMENT
Procedure:
1. Load the continuously-recorded disc. (Refer to “5-5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 25))
2. Turn the [ AMS ] knob to display “CPLAY1MODE”
(C34).
3. Press the [YES] button to display “CPLAY1MID”.
4. Press the [MENU/NO] button when “C = AD = )” is
displayed.
5. Turn the [ AMS ] knob to display “FBIAS ADJUST”
(C09).
6. Press the [YES] button to display “ / a = T”.
The first four digits indicate the C1 error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “a =” indicate
the focus bias value.
7. Turn the [ AMS ] knob in the clockwise and find the
focus bias value at which the C1 error rate becomes about 220
(refer to Note 2).
8. Press the [YES] button to display “ / b = T”.
9. Turn the [ AMS ] knob in the counterclockwise and find
the focus bias value at which the C1 error rate becomes about
220.
10. Press the [YES] button to display “ / c = T”.
11. Check that the C1 error rate is below 20 and ADER is 00.
Then press the
[YES] button.
12. If the “( )” in “ - - ( )” is above 20, press the [YES]
button.
If below 20, press the [MENU/NO] button and repeat the ad-
justment from step 2.
13. Press the Z button and take out the disc.
Note 1: The relation between the C1 error and focus bias is as shown in
the following figure. Find points A and B in the following figure
using the above adjustment. The focal point position C is auto-
matically calculated from points A and B.
Note 2: As the C1 error rate changes, perform the adjustment using the
average vale.
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
C1 error
about
220
B
CA
Focus bias value
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